This KML shows information about the 50 worst oil spills, from tanker accidents and drilling operations, as well as a number of other notable spills. Did you know that some of the biggest oil spills in history were actually intentional?
CTX: Center for Tankship Excellence (most complete tanker accident database on the internet)
Cedre (very good database of oil spills)
NOAA Incident News (oil spill case studies)
Amazon Watch (information about Ecuador and Peru oil contamination)
ITOPF: International Tanker Owners Pollution Federation (oil spill statistics)
as well as Environment Canada Tanker Spills DB, Oil Rig incidents, InterTanko
Tools used: EarthPlot, Google Spreadsheet Mapper